​You're a multimillionaire Afghan "entrepreneur" who happens to be the brother of fabulously corrupt President Hamid Karzai, and you've just been accused by the Wall Street Journal of airlifting billions of dollars of U.S. aid out of Kabul under very shady circumstances.

Posner responds to the Journal'sscoop last week that more than $3 billion in American aid has been stuffed into suitcases and flown out of Afghanistan, and that Mahmood Karzai likely had something to do with it.

Posner, who is a former Wall Street lawyer, writes that "it is a shame that the Journal spent two days interviewing my client Mahmood Karzai and yet chose to include him" as a suspect in the story. He says Karzai "has never transferred large amounts of cash out of the country."

Finally, he pledges that "no Afghan businessman or politician or public figure is more transparent than Mahmood Karzai."